Preparation suitable for the indigo vat.



UNITE scmtrss PA ALBRECHT SCHMIDT AND ADOLF STEINDOBFF, OF HfiGI-ISM-ON-THE-MAIN, GERMANY,

ASSIGNORS TO FARBWERKE VORM. MEISTER LUCIUS 86 BR'll'NING, 0F HfiGHST-QN- THE-MAIN, GERMANY, A CORPORATION OF GERMANY. I

EBEPARATION SUITABLE FOR THE INDIGO VAT.

No Drawing.

To ezz whom it may concern:

.Be it known that We, ALnRscIrr SCHMIDT, Ph. D., chemist, and Anon S'rnmnomr, Ph. 1)., chemist, citizens of the Empire of Germany, residing at Hfichst-on-the-Main, Germany, have invented certain new and useful Improvements in Preparations Suitable for the Indigo Vat, of which the following is a specification.

In" U. S. Letters Patent Nos. 1,058,019 and 1,058,020, anted April 1, 1913, to Albrecht Schmic t, assignor, it has been set forth that indigo in an extremely finely-- divided form'is obtained by precipitating indico-leuco compounds in presence of aromatic sulfonic acids or carbox lic acids, for instance those containing tlie benzyl residue. Furthermore, in U. '8. Letters Patent No. 1,005,481, granted October 10, 1911, to Albrecht Schmidt, assignor, it has been set forth that by adding the bodies mentioned in Patent No. 1,058,019 to indigo-leuco compounds, there can be obtained indigo-white preparations possessing the property of particularly Well dividing in the cold glucose vat, in such a manner that the indigo separating during the useof this vat, under the action, of atmospheric.

oxygen, is not obtained in the usual form but in the easily-reducible form, described in Patent No. 1,058,019. Now, we-have found that in a similar way and with a similar result asstated with regard to indigo-white in Patent No. 1,005,481, there can also be manufactured preparations from indigo by the addition or interaction of the bodies named in Patents 1,058,019

Example: 1000 parts by weight of indigo-paste of 20% are-mixed with 40, or 100 or 200 parts of sodium benzylsulfanilate, or of the salts of one of the other acids named in Patent 1,058,019, forin- Specification of Letters Patent.

Application filed July 18, 1911. Serial No. 639,087.

Patented May 12, 191.4.

stance the salt of phenylbenzyldimethylammoniumchlorid disulfonic acid. The mixture can be directly used for the vat. The mixture may also be triturated for a longer time, or ground or repeatedly passed in the form of a aste through the disintegrator, or it may lie heated for a prolonged time to a higher temperature while stirring.

acids per se. and their our invention,

1.1K mixture containing indigo and an aromatic acid radical, which latter possesses no dyeing properties. V 2. A mixture containing indigo and a benzyl-sulfanilic-acid radio-ah 3. A mixture containing indigo and an aromatic acid radical, which latter possesses no dyeing properties, and a saccharine substance.

st. A mixture containing indigo, a. benzyl-sulfanilic-acid radical, and a saccharine substance.

In testimony whereof, We aflix our signatures in presence of two-witnesses.

ALBRECHT- SCHMIDT. ADOLF STEINDORF F. Witnesses:

JEAN (iiRUND', {CARL Grimm). 

